The heirs to Wal-Mart's fortune are among the world's wealthiest,
with just four members of the
Walton family estimated to be worth $144 billion.

But the family members give
very little of their own cash to their charitable foundation,
according to a new
report by Walmart 1 Percent, a group supported by the
union-backed Making Change at Walmart.
Forbes first published a story on the report.

The foundation, which was
established in 1988, spent $325 million in 2013 on education
reform, environmental conservation, and causes in Wal-Mart's home
region of Northwest Arkansas, according to its website.

The foundation has also
poured roughly $1 billion into the Crystal Bridges Museum of
American Art in Bentonville, Ark., a museum headed up by Alice
Walton, the daughter of Wal-Mart founder Sam Walton.

Here are some key findings from
the report, which examined 23 years of the foundation's
activities:

Rob and Alice Walton (the son
and daughter of Wal-Mart founder Sam Walton) made zero
individual contributions to the Foundation during the 23 years
examined

Jim Walton (Sam Walton's
youngest son) made a single personal contribution of $3 million
to the Walton Family Foundation more than 15 years ago

Rob, Jim, and Alice Walton
and the family holding company they control (Walton
Enterprises) have
been responsible for only .13% of all contributions to the
Walton Family Foundation ($6.4 million)

Among the second generation
Walton heirs, it is the in-law, Christy, who has been
responsible for
the largest share of contributions to the Foundation

The four Walmart heirs and
Walton Enterprises combined have been responsible for only
1.2% of all
contributions to the Walton Family Foundation

The combined lifetime
contributions of the second generation Walmart heirs and their
family holding
company to the Walton Family Foundation come to $58.49
million

The report points to evidence that the Waltons use the foundation
to avoid estate and gift taxes, as
Bloomberg first revealed in September 2013.

It also highlights the apparent
disparity between the Waltons' charitable giving and that of
other billionaires, such as Bill Gates and Warren Buffett.

A Walton Family Foundation
representative who reviewed the report gave this statement to
Forbes:

"Since 1987, the Walton family has contributed more than $5
billion to charitable organizations and causes. Family members
living and deceased have provided generously for the foundation.
The family has planned for the continued growth of the foundation
and intends for grant making to progressively increase over
time."